Add configuration functions for HTTP cache type to Obj-C and C++

components/cronet/ios/Cronet.mm

Index: components/cronet/ios/Cronet.mm
diff --git a/components/cronet/ios/Cronet.mm b/components/cronet/ios/Cronet.mm
index 09b3c53b60f21dd13b510ea559f75abd1f0ecb15..65d5e87ca5bf58408c01958f0187c7fd939e7eb9 100644
--- a/components/cronet/ios/Cronet.mm
+++ b/components/cronet/ios/Cronet.mm
@@ -33,6 +33,8 @@ base::LazyInstance<std::unique_ptr<cronet::CronetEnvironment>>::Leaky
 
 BOOL gHttp2Enabled = YES;
 BOOL gQuicEnabled = NO;
+cronet::URLRequestContextConfig::HttpCacheType gHttpCache =
+    cronet::URLRequestContextConfig::HttpCacheType::DISK;
 ScopedVector<cronet::URLRequestContextConfig::QuicHint> gQuicHints;
 NSString* gUserAgent = nil;
 BOOL gUserAgentPartial = NO;
@@ -159,6 +161,23 @@ class CronetHttpProtocolHandlerDelegate
   gSslKeyLogFileName = sslKeyLogFileName;
 }
 
++ (void)setHttpCacheType:(CRNHttpCacheType)httpCacheType {
+  [self checkNotStarted];
+  switch (httpCacheType) {
+    case CRNHttpCacheTypeDisabled:
+      gHttpCache = cronet::URLRequestContextConfig::HttpCacheType::DISABLED;
+      break;
+    case CRNHttpCacheTypeDisk:
+      gHttpCache = cronet::URLRequestContextConfig::HttpCacheType::DISK;
+      break;
+    case CRNHttpCacheTypeMemory:
+      gHttpCache = cronet::URLRequestContextConfig::HttpCacheType::MEMORY;
+      break;
+    default:
+      DCHECK(NO) << "Invalid HTTP cache type: " << httpCacheType;
+  }
+}
+
 + (void)setRequestFilterBlock:(RequestFilterBlock)block {
   if (gHttpProtocolHandlerDelegate.get())
     gHttpProtocolHandlerDelegate.get()->SetRequestFilterBlock(block);
@@ -176,6 +195,7 @@ class CronetHttpProtocolHandlerDelegate
 
   gChromeNet.Get()->set_http2_enabled(gHttp2Enabled);
   gChromeNet.Get()->set_quic_enabled(gQuicEnabled);
+  gChromeNet.Get()->set_http_cache(gHttpCache);
   gChromeNet.Get()->set_ssl_key_log_file_name(
       base::SysNSStringToUTF8(gSslKeyLogFileName));
   for (const auto* quicHint : gQuicHints) {